Seren H. Bagcilar, Cody C. Reed, Simon R. Poulson, Paul S. J. Verburg, Benjamin W. Sullivan
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引用次数: 0
摘要
土壤碳(C)稳定性是旨在增加长期碳储存的管理的一个重要考虑因素。分配给受物理化学保护的矿物相关有机质(MAOM)的土壤碳的比例是常见的土壤碳稳定性基准。然而,土壤碳储量持久性的实际情况要比单纯的矿质相关有机质含量复杂得多--尤其是在草地等生态系统中,地下碳输入的速率很高,会刺激矿质相关有机质的分解。在这里,我们结合了土壤 C 持久性的三个指标来描述草甸恢复时序中的土壤 C 稳定性,平均地下 C 增加量为 330 g C m-2 y-1 ,持续约 20 年:(1) 土壤碳在 MAOM 和颗粒有机物 (POM) 中的比例,(2) 土壤碳在不同温度下分解的敏感性,以及 (3) 微生物对 MAOM-C 的利用。有两个指标表明,在山地草甸恢复后,土壤碳的稳定性可能会增加。随着土壤碳浓度的增加,MAOM 中的碳储量增加,而 POM 中的碳储量没有增加(指标 1)。随着不同温度下土壤碳浓度的增加,MAOM-C 的分解敏感性(相对于 MAOM-C 的微生物呼吸作用)降低(指标 2)。稳定同位素结果无法明确确定二氧化碳外流的来源(指标 3),但为今后的研究提供了假设。我们认为,山地草甸恢复后固存的碳可能是稳定的,这对区域碳储存目标具有影响。此外,我们的数据还显示了复杂的矿物相关碳动态,包括植物输入对草甸土壤中 MAOM 形成的潜在重要性。
Does montane meadow restoration influence the mineral association and stability of soil carbon?
Soil carbon (C) stability is an important consideration for management that aims to increase long-term C storage. The fraction of soil C allocated to physico-chemically protected mineral-associated organic matter (MAOM) is a common soil C stability benchmark. However, the reality of soil C persistence is more complex than MAOM content alone—particularly in ecosystems such as meadows with high rates of belowground C inputs that can stimulate MAOM decomposition. Here, we combined three metrics of soil C persistence to characterize soil C stability across a meadow restoration chronosequence averaging belowground C gains of 330 g C m−2 y−1 for ~20 y. The metrics were: (1) the fraction of soil C in MAOM and particulate organic matter (POM), (2) the susceptibility of soil C to decomposition under varying temperatures, and (3) the utilization of MAOM-C by microbes. Two metrics suggested soil C stability may increase following montane meadow restoration. As soil C concentration increased with restoration, C storage in MAOM, but not POM, increased (metric 1). The susceptibility of MAOM-C to decomposition (microbial respiration relative to MAOM-C) decreased with increasing soil C concentration across temperatures (metric 2). Stable isotope results could not definitively determine the source of carbon dioxide efflux (metric 3) but generate hypotheses for future research to address. We posit that C sequestered following montane meadow restoration could be stable, with implications for regional C storage objectives. Further, our data point toward complex mineral-associated C dynamics including the potential importance of plant inputs for MAOM formation in meadow soils.
期刊介绍:
Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.